Location: Long Island, NY
Service Type: Structural Support, Crawl Space Beam Leveling, Basement Waterproofing

The Problem: Structural Instability & Water Intrusion at Multiple Critical Points

A residential property in Long Island, NY, was experiencing multiple structural and waterproofing concerns that threatened the integrity of the foundation. The homeowner contacted Zavza Seal LLC after noticing signs of settlement, crawl space sagging, and water leaks in the basement boiler room.

Subject Area A: Failing Lally Columns on Unstable Footings

The existing Lally columns in the crawl space were installed on unreliable footings, posing a serious risk to the home’s structural stability. Without firm foundational support, the columns could no longer bear the intended load effectively.

Subject Area B: Sinking Center Beam in Crawl Space

The central support beam in the crawl space had significantly sagged, resulting in uneven floors and shifting load distribution. This created structural stress and compromised interior livability.

Subject Area C: Exterior Foundation Wall Water Intrusion

At the south-west to north-west corner of the house—specifically behind the oil tank in the basement boiler room—there was visible water intrusion. The source was traced to the wall-floor joint, where hydrostatic pressure and poor sealing allowed moisture penetration.

Subject Area D: Interior Foundation Wall Near Boiler

A final concern was at the interior wall behind the boiler, where the foundation joint required sealing and waterproof reinforcement to stop internal seepage and prevent future structural deterioration.

The Solution: Comprehensive Structural Stabilization & Waterproofing

Zavza Seal LLC developed a strategic, multi-area plan tailored to stabilize the foundation and address the waterproofing issues.

✅ Subject Area A: Lally Column Replacement and Footing Reinforcement

• Removed both unstable Lally columns to access underlying footings.
• Poured new reinforced concrete footings and allowed them to cure properly to form a solid foundation base.
• Installed new concrete-filled steel posts on the freshly cured footings to ensure long-term structural integrity.

✅ Subject Area B: Crawl Space Beam Leveling

• Utilized precision phase jacking to gradually lift and level the central beam in the crawl space without causing any sudden shifts or damage.
• This careful approach ensured load balance was restored and the risk of future sagging was minimized.

✅ Subject Area C: Waterproofing the Exterior Foundation Wall

• Excavated down to the base of the existing footing along the 43-inch exterior wall span.
• Cleaned the wall and applied 4.5 oz reinforced fiber mesh layered between 7,000 PSI waterproofing cement for robust structural sealing.
• Installed a liquid waterproofing membrane with extra focus on the critical wall-footing joint.
• Laid a 4-inch perforated PVC drain pipe, wrapped in a soil separator fabric and embedded in gravel, to serve as a groundwater pressure relief system.
• Installed a Delta dimpled waterproofing membrane (HDPE-based) to allow incidental water to safely travel down to the drainage zone.
• Backfilled and tamped the area for final stabilization.

✅ Subject Area D: Waterproofing the Interior Foundation Wall

• Accessed the narrow space behind the boiler using grinder extensions to reach the joint effectively.
• Applied fiber mesh reinforcement, again sandwiched between two layers of high-performance waterproof cement, to stop minor internal leaks and strengthen the wall system.

Results & Client Satisfaction

The homeowner now enjoys:

• A structurally sound crawl space with reinforced footings and level floors.
• Permanent steel column supports that meet modern building standards.
• A fully waterproofed basement corner, both inside and out, with advanced membrane and drainage protection.
• Peace of mind knowing that Zavza Seal LLC’s craftsmanship will prevent further settlement and intrusion issues.

Need Structural and Waterproofing Services in Long Island, NY?

Whether you’re dealing with failing Lally columns, a sinking crawl space beam, or water intrusion behind your boiler, Zavza Seal LLC offers expert diagnosis and repair for all your foundation and crawl space needs.

📞 Contact us today for a professional inspection and tailored solution!